Add missing frontmatter. Remove duplicate URLs

docs/ai-tools/README.md

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 VictoriaMetrics Observability Stack integrates with AI assistants through [MCP servers](https://docs.victoriametrics.com/ai-tools/#mcp-servers)
 and [agent skills](https://docs.victoriametrics.com/ai-tools/#agent-skills).
 The integrations allow AI agents and automation tools to query Metrics, Logs, and Traces, analyze telemetry data, 

docs/guides/connecting-vm-components-to-cloud-storage/README.md

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 Several VictoriaMetrics components can connect to cloud storage to read or write object data.
 
 The following table shows the supported types of storage for each component:

docs/guides/grafana-vmauth-openid-configuration/README.md

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 Using [Grafana](https://grafana.com/) with [vmauth](https://docs.victoriametrics.com/victoriametrics/vmauth/) is an effective way to provide [multi-tenant](https://docs.victoriametrics.com/victoriametrics/cluster-victoriametrics/#multitenancy) access to your metrics, logs, and traces.
 vmauth provides a way to authenticate users using [JWT tokens](https://en.wikipedia.org/wiki/JSON_Web_Token) {{% available_from "v1.138.0" %}} issued by an external identity provider.
 Those tokens can include information about the user and their tenant, which vmauth can use to restrict access so users only see metrics in their own tenant.

docs/opentelemetry/README.md

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 VictoriaMetrics software provides native [OpenTelemetry](https://opentelemetry.io/) ingestion across **metrics**, **logs**, and **traces** via dedicated components.
 This allows running OpenTelemetry-based observability pipeline with VictoriaMetrics software as your backend.
 
@@ -88,4 +96,4 @@ Depending on the Grafana datasource plugin there could be multiple correlations
 1. Trace to metrics, metric to logs, metric to traces - see [correlations via VictoriaMetrics plugin](https://docs.victoriametrics.com/victoriametrics/integrations/grafana/datasource/#correlations).
 1. Metrics to logs or traces correlations are possible via Prometheus datasource as well.
 1. Plugins Tempo, Jaeger, and Zipkin can correlate with logs or metrics using [Trace to logs](https://grafana.com/docs/grafana/latest/explore/trace-integration/#trace-to-logs)
-  and [Trace to metrics](https://grafana.com/docs/grafana/latest/visualizations/explore/trace-integration/#trace-to-metrics) feature.
+  and [Trace to metrics](https://grafana.com/docs/grafana/latest/visualizations/explore/trace-integration/#trace-to-metrics) feature.

docs/playgrounds/README.md

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 VictoriaMetrics offers public playgrounds where you can try the full observability stack online.
 
 Some playgrounds are based on the [OpenTelemetry Astronomy Shop demo](https://github.com/open-telemetry/opentelemetry-demo), a sample microservices application that generates realistic metrics, logs, and traces. Other playgrounds use benchmark workloads such as [prometheus-benchmark](https://github.com/VictoriaMetrics/prometheus-benchmark) to demonstrate ingestion and query performance for Prometheus-compatible systems.
@@ -158,4 +166,4 @@ Iximiuz Labs provides various [learning-by-doing resources for VictoriaMetrics](
   - [VictoriaMetrics cluster](https://labs.iximiuz.com/playgrounds/victoriametrics-cluster)
   - [VictoriaMetrics on Kubernetes](https://labs.iximiuz.com/playgrounds/victoriametrics-kubernetes)
 
-Iximiuz Labs requires a [free account](https://labs.iximiuz.com/signup) to access the materials.
+Iximiuz Labs requires a [free account](https://labs.iximiuz.com/signup) to access the materials.